The long and protracted wait by the 76ers to get center Andrew Bynum on the floor ended Friday as the center participated in a spirited practice, according to multiple sources.

According to at least two of the sources, Bynum, who has been working out with coaches and team medical personnel exclusively, participated in a five-on-five scrimmage with teammates. Just how long the scrimmage lasted was unknown.

This is a huge step for Bynum and the Sixers, who have just 30 games remaining in the regular season, including Saturday's game with the defending champion Miami Heat, winners of nine straight. For both parties, the most important element now is to see how Bynum's knees react in the coming days.

Earlier this week, Bynum, who has been recovering from bilateral bone bruises and weakened cartilage in both knees, told reporters that he thought he might be able to begin practicing with his teammates in one or two weeks. He also has said that he had ramped up his activity in recent days.

The 76ers and center Andrew Bynum are considering arthroscopic surgery on the player’s right knee in order to clean out loose cartilage, a procedure that would likely end the season for the center for whom they traded so many young assets, according to sources with knowledge of the situation.

Bynum suffered a setback in the form of swelling in his right knee following his participation in a five-on-five scrimmage, first reported in the Inquirer, last Friday. While the Sixers have been unable to practice recently due to the schedule, Bynum would not have been able to participate due to the swelling in his knee, which was also first reported by the Inquirer on Friday.

Bynum said his left knee “feels good.”

Following practice at Philadelphia College of Medicine on Friday, Bynum acknowledged that his season might in fact be over.

“Now it’s getting a little late, so I really don’t know,” Bynum said when asked if he were considering sitting out the final two months of the 76ers season. “I played in one scrimmage and [I have] a four- to five-day setback,” Bynum said of his latest setback. Bynum added that he is “just getting treatment and trying to push the fluid out” of his knee.